CN104327810B - A kind of low frictional resistance drilling fluid of Solid Free - Google Patents
A kind of low frictional resistance drilling fluid of Solid Free Download PDFInfo
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- CN104327810B CN104327810B CN201410419668.XA CN201410419668A CN104327810B CN 104327810 B CN104327810 B CN 104327810B CN 201410419668 A CN201410419668 A CN 201410419668A CN 104327810 B CN104327810 B CN 104327810B
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Abstract
The invention discloses a kind of low frictional resistance drilling fluids of Solid Free, belong to oil field drilling fluids technical field, using water as base fluid, by xanthans 0.2% ~ 0.5%, fluid loss additive A 0.2% ~ 0.5%, carboxymethyl starch 1% ~ 3%, low glutinous polyanion cellulose 0.2% ~ 0.5%, calcium carbonate superfine powder 1% ~ 2%, lubricant B2% ~ 3%, organic salt C40% ~ 200%, it is 8 ~ 10 to adjust pH value with sodium hydroxide after mixing by mass percentage, mixture is obtained through high temperature ageing, temperature resistance ability is up to 135 DEG C, controlling density ranging from 1.20 ~ 1.50g/cm3, drilling fluid has good rheological characteristic and leak-off under high temperature, has lower mud cake coefficient of viscosity and cyclic pressure dissipation, higher rejection.It can effectively solve that existing clay-free drilling fluid density is low, temperature resistance is relatively low, it is difficult to meet the problem of drilling well under the conditions of much higher formation pressures needs.
Description
Technical field
The present invention relates to a kind of low frictional resistance drilling fluids of Solid Free, belong to oil field drilling fluids technical field.
Background technology
With deepening continuously for oil-gas exploration and development, in the drilling well of some exceptional wells such as horizontal well, slim hole well and deep-well
In, the requirement to property of drilling fluid is higher and higher, such as takes lithology energy, lubricity etc. in stabilizing borehole ability, drilling fluid, right
Higher requirements are also raised for antipollution, temperature resistance ability, frictional resistance of drilling fluid etc..It is easily thickened due to containing bentonite drilling fluid, with
Barite, bloodstone etc. do the drilling fluid of weighting material in drilling well, often result in high frictional resistance and the pressure loss is big, be transmitted to underground
The waterpower of motor is relatively low, and will produce high cycle equal yield density in annular space, and higher, discharge capacity is pumped when easily causing drillng operation
Small, annular space returns that speed is low, and band sand is difficult, wellbore cleaning is bad, suppresses pump often, suppresses phenomena such as turntable, blocked portion, also has when serious
It may lead to the generation of leakage, therefore drilling fluid is faced with the while of improving density and also needs to reduce the problem of frictional resistance, Solid Free is low
Frictional resistance drilling fluid can meet this requirement.
Now, common clay-free drilling fluid is mostly aggravated with sodium chloride, and density only reaches 1.20g/cm3, cannot be satisfied compared with
Drilling well under the conditions of high formation pressure needs, and the corrosivity of inorganic salts is stronger.Patent 201010172378.1 discloses one kind
Clay-free drilling fluid, the clay-free drilling fluid composition：It is calculated with addition in every 100 milliliters of water, 0.1-0.5 grams of xanthans,
0.3-0.7 grams of carboxymethyl cellulose, 3-10 grams of lubrication inhibitor, 1-5 grams of sulfonated gilsonite, 1-5 grams of calcium carbonate superfine powder, without infiltration bore
1-3 grams of well liquid inorganic agent BST- II, 130 DEG C of the invention temperature resistance, density is 1.04g/cm when not aggravating3, density is reachable after exacerbation
1.4g/cm3, heavy weight additive is barite.Patent 201210215236.8 discloses a kind of clay-free drilling fluid, which is characterized in that
It is 0.2-2wt% that polymer, which is swollen the preferred dosage of particle, and the salt is KCl or NaCl, and preferably dosage is 0.1-5wt%, alkali
It is preferred that dosage is 0.1-0.2wt%, 120 DEG C of the invention temperature resistance is suitable for low pressure, the gas reservoir that Fracture with low permeability is developed, but without true
The drilling fluid density data cut.These clay-free drilling fluids have that density is low, temperature resistance is relatively low, and therefore, existing nothing is solid
Phase drilling fluid cannot meet the brill of some exceptional wells such as horizontal well, slim hole well and deep-well under the conditions of much higher formation pressures well
To the requirement of reduction frictional resistance etc. during well operations.
Invention content
The purpose of the content of present invention is to solve that existing clay-free drilling fluid density is low, temperature resistance is relatively low, it is difficult to meet higher
The problem of drilling well needs under condition of formation pressure, and provide a kind of Solid Free low frictional resistance drilling fluid.
The invention is realized by the following technical scheme：
The present invention is formed sediment using water as base fluid by xanthans 0.2%~0.5%, fluid loss additive A 0.2%~0.5%, carboxymethyl
Powder 1%~3%, low glutinous polyanion cellulose 0.2%~0.5%, calcium carbonate superfine powder 1%~2%, lubricant B 2%~
3%, organic salt C 40%~200%, it is 8~10 to adjust pH value with sodium hydroxide after mixing by mass percentage, mixture warp
High temperature ageing and the low frictional resistance drilling fluid of Solid Free.
The fluid loss additive A is 2- methyl -2- acryloxypropyls sulfonic acid, acrylamide, acrylic acid and 2- hydroxyls -3-
Methacryloxypropyl trimethyl ammonium chloride presses (10~20)：(10~15)：(2~8)：1 mass ratio is configured to aqueous solution,
The pH value that aqueous solution is adjusted with sodium hydroxide is 9.0~11.0, and ammonium persulfate is then added and sodium hydrogensulfite polymerize instead
It answers, the initial temperature of polymerisation is 20~50 DEG C, and polymerization time is 5~30 minutes, by product granulation, drying and crushing
, the general structure of fluid loss additive A is：
Wherein, x=14~22, y=2~12, z=4~10, r=0.42.
The lubricant B is the mixture of one or both of polymeric alcohol B1, polyether polyol B2.
The organic salt C is the mixture of one or both of sodium formate C1, potassium formate C2.
Beneficial effects of the present invention：
The low frictional resistance drilling fluid temperature resistance ability of Solid Free of the present invention is up to 135 DEG C, controlling density ranging from 1.20~1.50g/
cm3, drilling fluid has good rheological characteristic and leak-off under high temperature, identical close with 201010172378.1 embodiment 7 of patent
The 3# drilling fluids of degree are compared, and have higher rejection ability, lower mud cake coefficient of viscosity and cyclic pressure dissipation.
Description of the drawings
Fig. 1 is the cyclic pressure dissipation comparison diagram of embodiment 3 and comparative example 1.
Specific implementation mode
Below by embodiment, the present invention will be further described：
One, preparation example
(1) fluid loss additive A
Preparation example A1：
By 26.0 grams of 2- methyl -2- acryloxypropyls sulfonic acid, 39.0 grams of acrylamide, 20.0 grams of acrylic acid and 2- hydroxyls
2.6 grams of base -3- methacryloxypropyls trimethyl ammonium chloride is configured to aqueous solution at room temperature, is adjusted with sodium hydroxide water-soluble
Then the pH value of liquid is added 0.05 gram of ammonium persulfate and 0.05 gram of sodium hydrogensulfite causes polymerization, the starting of polymerisation to 9.0
Temperature is 20 DEG C, and polymerization time is 5 minutes, and product is granulated, is dried, is crushed up to fluid loss additive A1, structural formula is：
Preparation example A2：
By 56.0 grams of 2- methyl -2- acryloxypropyls sulfonic acid, 28.0 grams of acrylamide, 10.0 grams of acrylic acid and 2- hydroxyls
2.8 grams of base -3- methacryloxypropyls trimethyl ammonium chloride is configured to aqueous solution at room temperature, is adjusted with sodium hydroxide water-soluble
Then the pH value of liquid is added 0.2 gram of potassium peroxydisulfate and 0.2 gram of sodium thiosulfate causes polymerization, the starting of polymerisation to 11.0
Temperature is 50 DEG C, and polymerization time is 20 minutes, and product is granulated, is dried, is crushed up to fluid loss additive A2, structural formula is：
Two, embodiment
Embodiment 1：
Take 270mL clear water, 135 grams of C1,135 grams of C2 be added under the conditions of high-speed stirred, stir 20 minutes, fully after dissolving
Sequentially added under the conditions of high-speed stirred 0.54 gram of xanthans, 0.81 gram of A1,5.4 grams of carboxymethyl starch, 0.81 gram it is low it is glutinous poly- cloudy from
Subbundle element, 2.7 grams of calcium carbonate superfine powders, 5.4 grams of B1 are stirred 20 minutes, and it is 8 to adjust pH value with sodium hydroxide, is packed into ageing can
It is interior through 135 DEG C/16 hours, obtain density be 1.35g/cm3The low frictional resistance drilling fluid of Solid Free.
2~4 step of embodiment is same as Example 1, and inorganic agent type and dosage are as shown in table 1.
1 embodiment of table, 2~4 inorganic agent dosage
Note：NaOH is sodium hydroxide, XC is xanthans, CMS is carboxymethyl starch, LV-PAC is low glutinous polyanion fiber
Element.
By the drilling fluid of each embodiment after 135 DEG C of high temperature ageings 16 hours, it is as shown in table 2 to measure property of drilling fluid：
The property of drilling fluid of 2 Examples 1 to 4 of table
Note：ρ is drilling fluid density, and PV is plastic viscosity, YP is yield value, and Gel is the quiet of drilling fluid 10 seconds and 10 minutes
Shear force, FL are middle filter pressing loss, and Kf is mud cake coefficient of viscosity.
As shown in Table 2, the plastic viscosity of above-described embodiment is between 25.0~41.0mPa.s, yield value 12.5~
Between 24.0Pa, middle filter pressing loss be less than 3.6mL, illustrate the low frictional resistance drilling fluid of Solid Free of the present invention have good rheological characteristic and
Leak-off；Density is in 1.20~1.50g/cm3Between when, mud cake coefficient of viscosity be less than 0.0524, much higher formation pressures can be met
Under the conditions of reduce frictional resistance requirement.
Two, comparative example
Comparative example 1：Using the 3# drilling fluids in 201010172378.1 embodiment 7 of patent, composition：With every 100 milliliters
In water addition calculate, 3 grams of lubrication inhibitor, 0.3 gram of xanthans, 1 gram of calcium carbonate superfine powder, 2 grams of sulfonated gilsonite, without infiltration drilling well
II 2 grams of liquid inorganic agent BST-, 0.4 gram of carboxymethyl cellulose, 167 grams of barite stir 20 minutes, are packed into ageing can through 135
DEG C/aging in 16 hours obtains density 1.40g/cm3Drilling fluid.Property of drilling fluid is measured, is shown in Table 3.
The property of drilling fluid of 3 comparative example 1 of table
Three, embodiment 3 and the evaluation of 1 performance comparison of comparative example
(1) barite volume fraction and mud cake coefficient of viscosity
By 3 experimental data of table it is found that being without weighting materials, mud cake coefficient of viscosities such as barite, Iron Ore Powders in embodiment 3
0.0437；The drilling fluid of comparative example 1 is with barite as weighting material, and barite volume fraction is 9.1%, mud cake coefficient of viscosity
It is 0.1051, it follows that the mud cake coefficient of viscosity of the present invention reduces 58.4% compared with comparative example 1.
(2) cyclic pressure dissipation
Using dynamic drilling fluid cyclic pressure dissipation simulation system, in the experiment conditions approximation feelings such as identical, viscosity of drilling fluid density
Under condition, embodiment 3 and 1 cyclic pressure dissipation Experimental comparison of comparative example are carried out, experimental result is shown in attached drawings 1, it is seen then that it is 0.49 that annular space, which returns speed,
~0.82m/s, cyclic pressure dissipation of the invention reduce by 12%~22% compared with comparative example 1.
By the mud cake coefficient of viscosity and cyclic pressure dissipation experimental result of embodiment 3 and comparative example 1 it is found that the present invention has well
Lubricity and lower cyclic pressure dissipation.
(3) rejection
Take Zhongyuan Oil Field Dong- pu Depression South Yellow River Ma Chang construct 12 well rock sample of horse crush, by 6~8 mesh rock samples respectively with reality
It applies example 3 and comparative example 1 to mix, after 135 DEG C of high temperature ageings 16 hours, crosses 40 mesh sieve, drying, room temperature claim under the conditions of 105 DEG C
Weight.Experimental result is shown in Table shown in 4.
4 shale recovery ratio of table
As shown in Table 4, landwaste primary recovery of the invention rises to 97.9% from the 9.8% of clear water, relative recovery
It is 94.8%, shows good inhibition, the inhibition than comparative example 1 significantly improves.
In conclusion in the present invention organic salt dosage be 40%~200%, clay-free drilling fluid density be 1.20~
1.50g/cm3.Compared with the 3# drilling fluids of equal densities in 201010172378.1 embodiment 7 of patent, Solid Free of the present invention is low
The landwaste relative recovery of frictional resistance drilling fluid rises to 94.8% by 60.4%, and mud cake coefficient of viscosity reduces 58.4%, cycle
Pressure consumption reduces 12%~22%.
Claims (2)
1. a kind of low frictional resistance drilling fluid of Solid Free, it is characterized in that：Using water as base fluid, by xanthans 0.2%~0.5%, filtrate reducing
Agent 0.2%~0.5%, carboxymethyl starch 1%~3%, low glutinous polyanion cellulose 0.2%~0.5%, calcium carbonate superfine powder
1%~2%, lubricant 2%~3%, organic salt 40%~200% adjust pH after mixing by mass percentage with sodium hydroxide
Value is 8~10, and mixture obtains the low frictional resistance drilling fluid of Solid Free through high temperature ageing；
The general structure of the fluid loss additive is：
Wherein, x=14~22, y=2~12, z=4~10, r=0.42；
The lubricant is the mixture of one or both of polymeric alcohol, polyether polyol；
The organic salt is the mixture of one or both of sodium formate, potassium formate.
2. the low frictional resistance drilling fluid of Solid Free according to claim 1, it is characterized in that：The fluid loss additive is 2- methyl-
2- acryloxypropyls sulfonic acid, acrylamide, acrylic acid and 2- hydroxy-3-methyl acryloxypropyl trimethyl ammonium chlorides are pressed
(10~20)：(10~15)：(2~8)：1 mass ratio is configured to aqueous solution, and the pH value for adjusting aqueous solution is 9.0~11.0, so
Ammonium persulfate is added afterwards and sodium hydrogensulfite carries out polymerisation, the initial temperature of polymerisation is 20~50 DEG C, polymerization time
It is 5~30 minutes, product is granulated, is dried and is crushed and obtain.
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106318348B (en) * | 2015-06-15 | 2021-01-08 | 中石化石油工程技术服务有限公司 | Thick oil pollution resistant drilling fluid |
| CN105295866A (en) * | 2015-11-05 | 2016-02-03 | 中石化石油工程技术服务有限公司 | Composite inorganic salt drilling fluid |
| CN106867484A (en) * | 2017-03-31 | 2017-06-20 | 中国石油集团川庆钻探工程有限公司工程技术研究院 | Drilling fluid that a kind of oil field extracted water is prepared and preparation method thereof |
| CN109233762B (en) * | 2017-07-10 | 2020-12-11 | 中国石油化工股份有限公司 | Drilling fluid, preparation method and application |
| CN109306262A (en) * | 2017-07-28 | 2019-02-05 | 中国石油天然气股份有限公司 | A kind of drilling fluid and its preparation method and application for high angle hole |
| CN113088266A (en) * | 2019-12-23 | 2021-07-09 | 中石化南京化工研究院有限公司 | High-performance environment-friendly drilling fluid |
| CN114233220B (en) * | 2022-01-13 | 2022-06-03 | 东北石油大学 | Method for reducing friction resistance of water-based drilling fluid mud cake with high harmful solid content |
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